“…Hence the phenolic hydroxyl groups at the lower rim
of the calixarenes represent an excellent reactive function for
the introduction of groups, which modify the shape, and the
complexing properties of these molecules. Preliminary work on the
lower rim of calixarenes has been started with alkylation and
acylation reactions, which have been reviewed extensively in books
[1, 9,
10] and review articles
[5–8]. Different lower-rim modifications can be done as follows.…”